power driven acft three letters e.g. OK-ABC; non-power-driven and ultralight (UL) acft four figures; UL on the register of the Aeronautical Amateur Association a combination of three letters and two figures

three letters e.g. YU-ABC; a letter & two figures for gliders & motor kites; two figure & a letter for non-powered aircraft; a letter & three figures for rescue parachutes

Seychelles

S7

three letters

Sierra Leone

9L

three letters

Singapore

9V

three letters

Slovakia

OM

three letters

Slovenia

LJ

three letters e.g. S5-ABC; (motor)gliders S5-1234

Solomon Islands

H4

three letters

Somalia

6O

three letters

South Africa

ZS

three letters

South Africa

ZU

three letters

Spain

EC

three letters e.g. EC-ABC

Sri Lanka

4R

three letters

St. Kitts & Nevis

V4

three letters

St. Lucia

J6

three letters

St. Vinc.&Grenadines

J8

three letters

Sudan

ST

three letters

Suriname

PZ

three letters

Swaziland

3D

three letters

Sweden

SE

three letters e.g. SE-ABC

Switzerland

HB

three letters e.g. HB-ABC; (motor)gliders HB plus up to four figures

Syria

YK

three letters

Taiwan

B

12345

Tajikistan

EY

12345

Tanzania

5H

three letters

Thailand

HS

three letters

Togo

5V

three letters

Tonga

A3

three letters

Trinidad & Tobago

9Y

three letters

Tunisia

TS

three letters

Turkey

TC

three letters e.g. ABC

Turkmenistan

EZ

A123

Turks & Caicos Islan.

VQ-T

AB

Tuvalu

T2

three letters

Uganda

5X

three letters

Ukraine

UR

three letters e.g. UR-GAA or five figures e.g. UR-85700

United Arab Emirates

A6

three letters

Uruguay

CX

three letters

USA

N

The following variants are used: N1 - N9 (FAA intern); N1A - N9Z, N1AA - N9ZZ; N10 - N99 (FAA intern); N10A - N99Z, N10AA - N99ZZ, N100 to N999, N100A - N999Z, N100AA - N999ZZ, N1000 - N9999, N1000A - N9999Z, N10000 TO N99999; Older planes often carry regs like NC12345. In the old days a second letter was used after the N: C (Standard), L (Limited), R (Restricted) and X (Experimental). These categories are no longer used sind the 1950s. NC12345 = N12345. The old regs are very often applied to old planes to make them look more authentic.